Bistro Menu Key Answer Key
Bistro Menu Activity
Resource Type
Teacher Reference
Calculation Breakdowns
1
Jordan's Lunch
Item Breakdown
Signature Burger $16.50 Lemonade $3.50
Subtotal $20.00
Percent Applications
Sales Tax (8%) +$1.60
Tip (15%) +$3.00
Final Total $24.60
2
The Dinner Date
Item Breakdown
Crispy Calamari $12.50 Pan-Seared Salmon $22.00 Penne Primavera $14.25 Sparkling Water (2) $8.50
Subtotal $57.25
Percent Applications
Sales Tax (8%) +$4.58
Tip (20%) +$11.45
Final Total $73.28
Price Tag Pro Teacher Guide Price Tag Pro
Teacher Facilitation Guide
9th Grade Math
Duration: 65 Minutes
Learning Objective
Students will be able to calculate and apply multi-step percent concepts—including sales tax, discounts, and gratuities—to real-world financial scenarios.
Key Concepts
Sales Tax
Added to the subtotal; goes to the government.
Discount
Subtracted from the original price.
Tip/Gratuity
Added for service; typically 15-20%.
Total Bill
Final amount after all additions/subtractions.
Materials
"Price Tag Pro" Slide Deck
The Bistro Menu Worksheet
Shopping Spree Project
Calculators
Receipt Exit Ticket
Instructional Arc & Pacing
0-10
Minutes
Hook: The Hidden Costs
Present a scenario where a student has exactly $10 and wants a meal priced at $9.95. Ask: "Can they buy it?" Use this to introduce sales tax . Briefly discuss how much "extra" things cost in real life versus the price tag.
10-25
Minutes
Direct Instruction: The Math Behind the Tag
Use the slides to model calculations. Emphasize two methods: Two-Step (calculate tax/discount first) and One-Step (multiply by 1.08 for 8% tax). Discuss why tax is calculated after discounts.
25-40
Minutes
Guided Practice: Bistro Bill Check
Distribute the Bistro Menu Activity . Students work in pairs to calculate total bills including tax and tip. Rotate to check for decimal placement errors—ensure they are converting 8% to 0.08, not 0.8.
40-60
Minutes
Independent Practice: Shopping Spree Project
Students apply a budget to a virtual shopping trip. They must select 4+ items, apply a 20% coupon, and add 9% tax. Challenge them to stay as close to $200 as possible without going over.
60-65
Minutes
Wrap-up: Receipt Check
Collect the Exit Ticket . Briefly discuss the conceptual question: "Why is it beneficial to calculate discount before tax?" to reinforce student understanding of financial efficiency.
Pro-Tips & Misconceptions
Common Errors
Adding discounts instead of subtracting them.
Calculating tax on the original price before the discount.
Confusing tip (added for service) with tax (added for government).
Quick Checks
"Is your final price for a discounted item lower than the original?"
"Did you move the decimal two places left to convert percent to decimal?"
Price Tag Pro Slides Price Tag Pro
Mastering Real-World Percents
9th Grade Mathematics
The $10 Dilemma
You have exactly $10.00 in your pocket.
The burger you want is listed on the menu for $9.95.
Can you afford it? Why or why not?
The Big Three
Sales Tax
Added to your subtotal. Money that goes to the government.
Discount
Subtracted from the original price. Savings for you!
Tip
Added to your bill. Extra money given for good service.
Method 1: The Two-Step
1
Find the Amount
Example: 8% tax on $20
20 × 0.08 = $1.60
2
Add or Subtract
Final Price:
20 + 1.60 = $21.60
Method 2: The Pro Multiplier
Sales Tax (8%)
Price × 1.08
Discount (20% off)
Price × 0.80
Why? 100% (original) + 8% (tax) = 108% of original price!
The Golden Rule
Always Calculate...
DISCOUNT
Then TAX
Why? You don't want to pay tax on money you saved!
Let's Try One
A pair of sneakers costs $80.00. There is a 25% off sale today. Sales tax is 7%.
Calculate the Total Cost
1 Discount: $80 × 0.25 = $20
2 New Price: $80 - $20 = $60
3 Tax: $60 × 0.07 = $4.20
Total: $64.20
Bistro Bill Check
Time to put your skills to the test. Head to The Bistro, place your order, and calculate your final check!
Calculators Ready
Partners Assigned
Shopping Spree Key Answer Key
Shopping Spree Project
Project Guide
Teacher Key
The Math Logic
Step 1: Discount
Subtotal × 0.80 = New Subtotal
Step 2: Tax
New Subtotal × 1.09 = Final Total
Discounts must be applied before tax calculations.
Price Reference
Wireless Pro Headphones$54.99
Fitness Tracker$39.50
Daypack$28.25
Instant Camera$72.00
Graphic Tee$19.99
Sunnies$24.50
Bluetooth Speaker$45.00
Water Bottle$15.75
Sample Student Solution
Selected Items
Instant Camera$72.00
Wireless Headphones$54.99
Sunnies$24.50
Bluetooth Speaker$45.00
Initial Subtotal: $196.49
20% Discount: -$39.30
New Subtotal: $157.19
Sales Tax (9%): +$14.15
Total: $171.34
Check:
Total of $171.34 is under budget. The student successfully met all criteria.
Bistro Menu Activity The Bistro
Name:
Date:
Our Specialties
Appetizers
Crispy Calamari $12.50
Garlic Truffle Fries $8.75
Garden Bruschetta $9.25
Main Courses
The Signature Burger $16.50
Pan-Seared Salmon $22.00
Penne Primavera $14.25
Sales Tax: 8% • Recommended Gratuity: 15% - 20%
Bill Check Scenarios
Problem 1: Lunch for One. Jordan ordered the Signature Burger and a Lemonade ($3.50). Calculate the subtotal, the 8% sales tax, and a 15% tip.
Subtotal
Tax & Tip
Final Total
Show calculations here
Problem 2: The Dinner Date. A couple ordered Calamari, Salmon, Penne, and two Sparkling Waters ($4.25 ea). Calculate the bill with 8% tax and a 20% tip.
Subtotal
Tax & Tip
Final Total
Show calculations here
Exit Ticket Key Price Tag Pro
Teacher Master Key: Exit Ticket 001
Answer Key
Qty/Item Price
1 HOODIE (LOGO) $45.00
Discount (10% off) -$4.50
New Subtotal $40.50
Sales Tax (6%) +$2.43
Total Due
$42.93
Key Concept Response
Teacher Reference Answer:
"Applying the discount first lowers the subtotal. Because sales tax is calculated on that lower subtotal, the customer ends up paying less total tax. If tax were applied to the original $45 price, the final bill would be significantly higher."
Calculation Rubric
3 pts: Accurate math for discount (-$4.50), subtotal ($40.50), and tax (+$2.43).
Reasoning Rubric
2 pts: Explains how a lower subtotal reduces the total tax amount paid.
Shopping Spree Project The Spree
Independent Shopping Project
Name:
Budget: $200.00
The Catalog
Pick 4+ items
Wireless Pro Headphones
$54.99
Fitness Tracker
$39.50
Daypack
$28.25
Instant Camera
$72.00
Graphic Tee
$19.99
Sunnies
$24.50
Bluetooth Spkr
$45.00
Water Bottle
$15.75
20%
OFF STOREWIDE
The Mission
Stay under $200.00. Calculate Discount first, then apply 9% sales tax to your final subtotal.
Shopping Bag
Item Name Price
Initial Subtotal: ________
20% Discount: ________
New Subtotal: ________
Sales Tax (9%): ________
Final Total: ________
Workspace: Show your multiplication & subtraction steps
Price Tag Pro Exit Ticket Price Tag Pro
Transaction: Exit Ticket 001
Name:
Period:
Qty/Item Price
1 HOODIE (LOGO) $45.00
Discount (10% off)
-$
New Subtotal
$
Sales Tax (6%)
+$
Amount Due
$
Reflect & Respond:
In today's lesson, we learned that discounts are applied before tax. Why is this beneficial for the customer?
Thank you for shopping math
